899945 has 4 divisors (see below), whose sum is σ = 1079940. Its totient is φ = 719952.

The previous prime is 899939. The next prime is 899971. The reversal of 899945 is 549998.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375769 + 524176 = 613^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 899945 - 2⁶ = 899881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 899896 and 899905.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 899945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89990 + ... + 89999.

It is an arithmetic number, because the mean of its divisors is an integer number (269985).

2⁸⁹⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

899945 is a deficient number, since it is larger than the sum of its proper divisors (179995).

899945 is a wasteful number, since it uses less digits than its factorization.

899945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179994.

The product of its digits is 116640, while the sum is 44.

The square root of 899945 is about 948.6543100624. The cubic root of 899945 is about 96.5469716829.

The spelling of 899945 in words is "eight hundred ninety-nine thousand, nine hundred forty-five".